Continuous trimmer for brush machines



April 3,1928. 1,664,425

C. JOBST CQNTINUOUS TRIMMER FOR BRUSH MACHINES Filed Feb. 19, 1925 3Sheets-Sheet 1 H LC D I I I T A 'll/l/l/l/IYI W mm MMZW M ATTORNEYJ April 1928. 1,664 25,

C. JOBST CONTINUOUS TRIMMER FOR BRUSH MACHINES Filed Feb. 19, 1925 3 Sheets-Sheet 2 INVENTOR. [aw/e90 7005 T 44M WW ll/3M A TTORNEYJ c. JOBST .CONTINUOUS TRIMMER FOR BRUSH MACHINES Filed Feb. 19, 1925 s sheets sheet '5 INVENTOR. [aye/90 Joesr BY mm 4% m ATTORNEYJ Patented Apr. 3, 1928.

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Application filed February The invention relates to machines for trimming the bristles of brushes, such for instance as tooth brushes, and consistsin the peculiar construction which permits of con tinuous operation to successively trim a series of such brushes to any predetermined shape.

In the drawings:

Figure 1 is a front elevation of the machine;

Figure 2 is a sectional plan view thereof;

Figure 3 is a cross section;

Figure at is an enlarged detailed sectional view through the flange.

In the manufacture of brushes, after the forming and setting of the tufts, it is necessary to trim the bristles. In certain types of brushes the bristles are all of uniform length, but in others, such as tooth brushes, they are cut to varying lengths and in different patterns. My improved construction of trimmer comprises essentially a rotary trimming cutter and an endless work carrier for carry ing a series of brushes past said trimmer and in operative relation thereto. This work holder is so constructed as to permit of easily engaging the brushes therewith at one point in the movement and at the same time to rigidly hold the brushes While operated upon by the cutter.

In detail, 1 is a suitable frame on which is mounted the electric motor 2 having a suitable driving connection, such as the sprocket chain 3 with the rotary spindle 41 for the trimming cutter, said spindle being journaled in bearings 5 of the frame. 6 is an endless work carrier journaled on a stub axle 7 carried by a slide 8, which is adjustably secured to the frame so as to permit adjustment of said work carrier towards or from the cutter spindle. The work carrier is driven from the motor 2 through the medium of a step down transmission shown as comprising the pulley 9 on the spindle 4 connected by a belt 10 with a pulley 11 mounted on the slide 8 and connected with a pinion 12 in mesh with a gear wheel 13. This gear wheel is also journaled on the slide 8 and drives a pinion M, which is in mesh with the gear wheel 15 journaled on the spindle 7 and coupled with the carrier 6, thus driving the latter at relatively slow angular speed.

The carrier 6 is provided with a peripheral flange 16 having a series of transverse channels 17 therein for receiving the backs of the brushes to be trimmed, and at opposite 1a, 1925. Serial No. 10,2ss.

sides of these channels slightly overlapping the same are the plates 18. 19 is a second flange within and concentric with the flange 16 and preferably spacedtherefrom. 20ai'e follower plates within the channels 17 having radially inwardly projecting shank portions 21 passing through bearings in the flange 16 and through enlarged apertures in thefiange 19. 22 are light t'ensioned springs sleeved upon the shanks 21between the followers 20 and the bottom of the recesses 17. 23 are cup-shaped sleeve members surrounding the inner ends of the shanks 21 and witl1in the enlarged apertures in the flange 19, and 24care springs of greater tension than the springs 22 between the ends of the shank 21 and the cup-shaped sleeve 23.

The carrier 6 is centrally providedwith a hub portion 25 which is journaled onthe stationarystub axle 7 and said axle projects beyond the hub into the space within the annular flange 19. In this space and mounted upon the stationary axle 7 is a cam member 26, the periphery ofwhich is eccentric to the axis of the'carrier. The side of this cam, which is adjacent to the rotary spindle 4, extends in close proximity to the flange 19, while the diametrically opposite side of the cam is spaced a greater distance from said flange. Thus in the rotation of the carrier the inner ends of the sleeves 23, which bear against the periphery of the cam, will be moved radially outward as they approach the rotary spindle, compressing the spring 2 1 and transmitting such pressure through the shank 21 to the follower 20. On the other hand, when the sleeves 23 are on the opposite side of the cam, sufficient clearance is provided to entirely relieve pressure on the springs 24 so that the only outward pressure on the follower 20 is the light tension of the spring 22.

The trimming cutter may be of any suitable construction fashioned to produce the desired contour in the bristles. As shown, the cutter 27 is detach-ably mounted on the spindle 1, being provided with a series of cutting blades which cooperate with a stationary shearing blade 28. The latter is mounted upon a bearing 29 which is adjust ably secured to the frame so that it may be set in the proper relation to the rotary cutter.

In operation, when the motor is started, rapid rotary movement is transmitted to the cutter 27 and a slow rotary movement to the carrier 6. The brushes are then successively engaged with the channels 17 of the carrier on the side diametrically opposite from the cutter, at which point the followers 20 are only under the light tension of the springs 22. Thus the operator may readily press back such followers by inserting the brush back between the same and the overlapping flanges of the plates 18, which permits the bristles to project radially outward. As the carrier travels around to the opposite side of thecam, the pressure of said cam upon the sleeves 23will compress the springs 24, which in turn will exert a strong pressure upon the followers and against the brush backs. Therefore, when the rotary cutter is performing its work upon the bristles, the brush back is firmly held in position. After the trimming operation the brushes are carried around to the opposite side, where they can be removed and untrimmed brushes inserted in place thereof.

What I claim as my invention is:

1. The combination with a trimmer, of a rotary cylindrical work carrier having a series of grooves on the periphery thereof extending transversely to the direction of rotation and adapted for receiving brush backs inserted endwise therein, shoulders on opposite sides of said grooves for limiting the radially outward movement of said brush backs and providing a space therebetween for the'outward passage of the bristles, a spring pressed follower in each transverse groove yieldable radially inward for the insertion of the brush back, and means arranged to bear on those followers of said carrier which are passing said trimmer to hold said brush backs firmly clamped.

2. The combination with a trimmer, of a rotary cylindrical work holder having a series 'of grooves on the periphery thereof extending transversely to the direction of rotation and adapted for the endwise reception of brush backs, means for limiting the outward movement of said brush backs in said grooves, a follower in each groove, a light-tensioned resilient element for pressing said followerradially outward, and means operating on said follower while passing said trimmer for increasing the resilient tension thereon to hold said brush back firmly in position. i

3. The combination with a trimmer, of a rotary cylindrical carrier having a series of grooves on the periphery thereof extending transversely to the direction of rotation and adapted for the endwise engagement of brush backs, means for limiting the outward movement of said backs in said grooves, a follower in each groove, a shank on said follower projecting radially inward, a lighttensioned resilient element for pressing said follower radially outward, a member telescopically engaging said shank, a heavytensioned resilient element between said member and shank, and a stationary cam with which said member is adapted to engage for moving the same radially outward to increase the pressure on said follower while passing said trimmer.

In testimony whereof I aflix my signature.

CONRAD JOBST. 

